47results about How to "Has a decolorizing effect" patented technology

A process for treating the sewage generated in extracting saponin from yam by hydrochloric acid method includes such steps as draining said sewage in quality and flow regulating pool, pumping it in pH regulating, reacting and depositing pool, flowing in aerating and electrolyzing reactor for pre-treating, flowing in another pH regulating, reacting and depositing pool, heating to 35-40 deg.C, anaerobic treating, inoculating Cl-resistant microbes, aerobic treating, inoculating Cl-resistant microbes, coagulating, depositing, oxidizing by ozone and adsorbing by activated carbon.

The invention belongs to the technical field of wastewater treatment, and particularly relates to a device for removing toxicity in traditional Chinese medicine wastewater by plasma discharge. The device is mainly composed of a plasma reactor, a pulse power supply, a sewage receiving tank, am air pump and a water pump. Traditional Chinese medicine wastewater is pumped from a sewage tank to the top of the reactor by the water pump; the middle part is provided with a discharge electrode, and the bottom is provided with the sewage receiving tank. The discharge electrode is connected with the external pulse power supply, and is the core of the whole device. The outer wall of the reactor is connected to the ground, thereby ensuring the electric safety of the whole device. Meanwhile, the air pump connects the upper part of the reactor with the top of the sewage receiving tank, and the gas generated by discharge is recycled and connected to an aeration tank by the air pump and introduced into the sewage receiving tank, thereby further enhancing the treatment efficiency. The device can effectively remove toxic groups in the traditional Chinese medicine sewage, is beneficial to subsequent biochemical degradation of the traditional Chinese medicine sewage to finally achieve the discharge standard, and has the advantages of simple treatment method, low cost and high efficiency.

The invention discloses an excess sludge treatment method which comprises the following steps: adding excess sludge to a reaction tank, with high speed stirring at 15-50 DEG C, adding a surfactant and sodium percarbonate to the reaction tank, after 0.5-5h of reaction, adding nano zero-valent iron, at 15-50 DEG C reacting for 1-8h, sending the sludge into a magnetic separator to remove the nano zero-valent iron containing heavy metals in the sludge; performing mechanical dewatering of the treated sludge to respectively obtain purified sludge and water. The excess sludge treated by the method is low in water content and high in heavy metal removal rate, the treated water is low in (chemical oxygen demand) COD value, and the excess sludge treatment method is low in cost, green, and free of secondary pollution, and can lay a foundation for agricultural or forestry sludge or other resource method.

The invention discloses a method of preparing proteins, chitin and chitosan from degreased shrimp meals of euphausia superba. The method comprises the following steps: 1, extracting the proteins; 2, preparing the chitin; 3, preparing the chitosan. By adopting the method, the proteins with high purity, the chitin and the chitosan with high deacetylation degree are prepared from waste shrimp meals used as raw materials, and effective development and utilization of euphausia superba resources are realized; as EDTA (Ethylene Diamine Tetraacetic Acid) is adopted to carry out decalcification, the decalcification effect is good, the decalcification rate of once decalcification can reach above 95 percent, the EDTA also has a decoloration effect during the decalcification, and the dosage of hydrogen peroxide used as a subsequent decolorant is greatly saved; the used EDTA can be recycled and reused, the recovery rate can reach above 85 percent; in addition, as the reaction is carried out under the neutral and slight alkaline conditions, the characters of the obtained chitin are more stable than those of the chitin obtained by virtue of a hydrochloric acid method, and the product performance is greatly improved; the whole process technology is simple, waste water, waste slag and organic reagents generated in the production process can be all recycled and turned into wealth, and the environment pollution is also lowered.

The invention relates to a processing technique for comprehensive waste water of saponin-alcohol. The processing technique for comprehensive waste water of saponin-alcohol is characterized by comprising the following steps: 1) draining the comprehensive waste water of saponin-alcohol into a regulating reservoir at first, infiltrating the comprehensive waste water of saponin-alcohol into a primary pH regulating desilter to regulate the pH value to 5.0-6.5, and then depositing; 2) improving the temperature of the comprehensive waste water into 30 DEG C by a sewage pump through a heat exchanger, and then pumping the comprehensive waste water into a hydrolytic acidification tank to implement hydrolysis acidification reaction; 3) spilling the comprehensive waste water into an acidification settling tank for clarification, and pumping the supernate into an inner aeration electrolyzation reactor to generate electrolyzation reaction; 4) feeding the supernate into a secondary pH regulating desilter to regulate the pH value to 7.0-8.0 and then depositing; 5) pumping the supernate into a collector well and improving the temperature to 38 DEG C, then feeding the supernate into an improved UASB reactor to implement anaerobic treatment through a charge pump; 6) feeding the supernate into a five-grade bio-contact oxidation reactor to implement aerobic treatment; 7) recycling or discharging the effluent after the supernate enters a depth processing unit and is processed after the flowing of the effluent flowing into the desilter to deposit.

The invention relates to a preparation method for an epoxy polyester plasticizer, belonging to the technical field of chemical synthesis. The preparation method comprises the following steps of: firstly carrying out reaction on an unsaturated dicarboxylic anhydride and a saturated dibasic alcohol under catalysis action to generate a polyester with a certain molecular weight, and then carrying out epoxidation reaction on the polyester under the conditions of introducing an oxygen source and using formic acid as a carrier to obtain the epoxy polyester plasticizer with a certain epoxide number. The product provided by the invention has the characteristics of light color and luster, low residual iodine value and high heat stability and are basically nontoxic; and the reaction process is short, is easy to operate, is low in energy consumption and cost, and meets pollution-free and clean production process.

The invention relates to a compound coagulant, which is prepared by jointly mixing the following raw materials by mass percent: 20%-30% of aluminum chloride, 1.0%-2.5% of poly dimethyl diallyl ammonium chloride, 5%-20% of aluminum sulfate, 1%-10% of ferric chloride, 0.03%-0.1% of cation PAM, and 50%-65% of deionized water. The compound coagulant has the beneficial effects that heavy metals and organic matters in an organic complex are removed through multiple actions, and the compound coagulant also has discolored action and a wide drug action range, can substitute a plurality of coagulants and is convenient to operate.

The invention discloses a dry degumming method of raw abandoned oil used for producing biodiesel. The method comprises steps that: (1) the abandoned oil is dehydrated; (2) a composite acid with a weight of 0.2 to 1.0% of that of the abandoned oil is added to the abandoned oil, wherein the composite acid is composed of strong phosphoric acid and citric acid according to a ratio of 2:1; the mixture is subject to a reaction for 50 to 90min under a reaction temperature of 100 to 120 DEG C, such that phospholipids form macro flocculating constituents; (3) a degumming absorbent with a mass of 0.5 to 2.0% of that of the raw materials is added to the raw materials; a vacuum degree is controlled at 0.080 to 0.098Mpa, a temperature is controlled at 110 to 130 DEG C, and the mixture is stirred for 30 to 60 min with a rate of 50 to 70r / min; (4) the mixture is processed through press filtration, and an obtained filtrate is a production raw material of biodiesel. The method provided by the invention has advantages of simple technology, high yield, and low production cost. Also, the method is energy saving and environment friendly.

The invention discloses an efficient intermittent rice-bran-oil degumming technology. The technology comprises: pumping rice-bran crude oil into an oil refining pot via an oil pump; heating, adding phosphoric acid with a concentration of 85% and stirring, so as to converse non-hydrated phosphatide in rice-bran crude oil into hydrated phosphatide; adding an alum solution accounting for 0.5%, so as to enable alum to dissolve in water in edible oil and generate aluminium hydroxide and phosphatide micelles through ionization, wherein aluminium hydroxide and phosphatide aggregates together and formed particles become bigger and bigger and precipitate in the bottom of the oil refining pot; and discharging from a pot-bottom valve of the oil refining pot. During flocculation of phosphatide, phosphatide floc includes a large amount of pigments and impurities and gives play to decolouring effect. By performing a plurality of times of water washing, phosphatide and other impurities in edible oil in the oil refining pot are removed. Degummed oil is sucked into a drying pot by vacuum suction force generated by a vacuum pump arranged in the system, and is subjected to water removing in vacuum environment and enters a subsequent cyclic decolouring process. Therefore, the odor-removing effect is realized without generating color reversion.

The invention provides a preparation method of dianhydrol. The preparation method comprises the following steps: carrying out acylation reaction on D-pantoic acid lactone and 3-aminopropanol in a solvent to obtain a mixed solution containing D-panthenol, wherein the reaction temperature of the acylation reaction is 10-35 DEG C. The yield of the D-panthenol obtained by the preparation method is high, and the purity is high; meanwhile, the recovered solvent can be continuously used, and is safe and environment-friendly.

The invention relates to a method for producing silicone oil with high hydrogen content by methyldichlorosilae through solvent-free hydrolysis. The method is characterized by comprising the following steps: adding methyldichlorosilae, trimethylchlorosilane and an organosilicone protecting agent into a reaction kettle, starting stirring and introducing nitrogen gas; continuously feeding domestic water to the reaction kettle, starting a liquid ring compressor, exhausting generated hydrogen chloride away, feeding the hydrogen chloride to a high boiling point cracking device, controlling the temperature in the reaction to be -50 DEG C to 15 DEG C, controlling the temperature of the reaction kettle to be below 15 DEG C after the domestic water is completely fed, reacting for 1 hours, and discharging 21-25% hydrochloric acid at the lower layer after standing and layering; transferring hydrolysate on the upper layer to a deacidification kettle, adding an adsorbent, and stirring for 1 hour to deacidify; taking supernatant liquid and adding into a telomerization kettle, adding activated clay, controlling the temperature to 55-75 DEG C, reacting for 3-6 hours, and filtering to obtain a hydrogen-containing silicone oil; and distilling the hydrogen-containing silicone oil in a distillation kettle, controlling the vacuum degree to -0.09 to 0.01Mpa and the temperature to 115-130 DEG C, and removing low molecules to obtain the hydrogen-containing silicone oil finished-product.

The invention discloses a discoloring Shiva engineering bacterium with multiple functions of fluorescent tracing and discoloring and a construction method of the discoloring Shiva engineering bacterium, and aims at providing a genetic engineering bacterium that has high-efficiency discoloring capability of three major dyes including azo, anthraquinone and triphenylmethane as well as the fluorescent tracing function. The invention adopts the technical proposal that combines a foreign fusion gene SPrtpmD' into a discoloring Shiva bacterium S12; wherein, the fusion gene SPrtpmD' is formed by connecting a discoloring enzyme modifier gene tpmD' of the triphenylmethane dye after a NAD(P)H dehydrogenase gene initiator sequence of the discoloring Shiva bacterium S12, and the discoloring enzyme modifier gene tpmD' of the triphenylmethane dye is formed by adding an SD sequence before a 5'-end initiation codon of the discoloring enzyme modifier gene tpmD' of the triphenylmethane dye and adding a small label that can chelate 6 encoding amino acids of a diarsenic fluorescent dye before a 3'-end termination codon. The discoloring Shiva engineering bacterium with multiple functions of fluorescent tracing and discoloring can be used for environmental reparation and administration.

The invention discloses a process for separating and removing citrinin in a nuclease liquid by utilizing a chromatographic technology, which comprises the following steps: loading a sample of a citrinin-containing nuclease liquid into a chromatographic column containing anion exchange resin, carrying out ion exchange, and collecting effluent to obtain a citrinin-free nuclease liquid. According tothe method, an ion exchange mechanism is utilized, the purpose of removing citrinin is achieved through a fixed bed, the content of citrinin in the product liquid is lower than a liquid phase detection limit, the enzyme activity of nuclease is improved through a chromatographic separation process and reaches 110%, and a certain decoloration effect is achieved.

The invention discloses a novel Bjerkandera sp. SZ-4 and application thereof, and belongs to the technical field of microorganisms. The invention discloses a strain of Bjerkandra sp. SZ-4, which has been deposited in Guangdong Microbiological Culture Collection Center on July 26, 2021 under a deposit number of GDMCC No: 61834 at Guangdong Microbiological Research Institute on Fifth Building, No. 59 Building, No. 100 Courtyard, Xianlie Middle Road, Guangzhou. The Bjerkandra sp. SZ-4 disclosed by the invention is separated from corncob residues, not only has a strong lignin degradation capability, but also has a function of degrading various dyes, and can decolorize lignin and dyes, and change the current situation that most of the bacteria have a single function. The discovery of the strain has important significance on degradation of lignin and dyes in the environment.

The invention relates to a method for preparing an efficient function material easy to separate and used for wastewater treatment. The method includes the following steps that (1) cobalt nitrate and chitosan are obtained and added to an acetic acid solution with the mass concentration ranging from 1% to 5% and ultrasonically treated for 5 to 15 min, wherein the weight ratio of the cobalt nitrate to the chitosan to the acetic acid solution is 5 to 15:5 to 10:500 to 2000; (2) spray drying is conducted on a mixed solution obtained from the step (1), so that tawny solid particles are obtained; (3) the solid particles are calcined at the temperature between 600 DEG C and 780 DEG C, so that a carbon-cobalt composite material of a mesoporous structure is obtained; (4) the carbon-cobalt composite material is put in a carboxymethylation chitosan aqueous solution with the mass concentration ranging from 1% to 5% and the mixture is stirred, sucked, filtered and dried, so that the function material is obtained. The method has the advantages that the function material is efficient, easy to separate, economical and reusable, and heavy metal, organic matter and the like in wastewater can be comprehensively treated.

The invention discloses a preparation method of peony seed oil. The method comprises the following steps: shelling peony seeds and removing impurities, then soaking the shelled peony seeds and storingat the low temperature, and crushing to 130-150 meshes to obtain peony seed powder; drying the peony seed powder at the low temperature; when the water content reaches 8-10%, soaking in anhydrous ethanol for 4-5h, and carrying out supercritical CO2 extraction to obtain peony seed crude oil; heating the peony seed crude oil up to 50-60 DEG C, adding a sodium hydroxide solution, stirring for 15-20min, then heating up to 70-80 DEG C, adding aluminum oxide, stirring for 20-30min, carrying out heat preservation and standing for 8-10h, separating to remove water layer and precipitate to obtain deacidified oil; decoloring and deodorizing the deacidified oil to obtain the peony seed oil. The preparation method of the peony seed oil is high in oil yield, and the obtained peony seed oil is high incontent of unsaturated fatty acid.

The invention relates to a preparation method of a compound coagulant. The compound coagulant is prepared by commonly mixing polysilic aluminum ferric chloride, diallydimethylammonium chloride (the viscosity is 8,000-12,000), magnesium sulfate and deionized water according to the mass ratio of 30 percent, 2 percent, 5 percent, and 62 percent. The invention has the advantages of removing heavy metals and organisms in an organic complex by multiple actions, having the effect of decolorization, wide medicine effect range and simple and convenient operation and replacing a plurality of coagulants for use.

The invention discloses a comprehensive water-saving process for producing stevioside. Down-column water generated in a resin adsorption step is subjected to purification treatment and a waste acid, a waste alkali and waste water, which are generated in an adsorption resin and desalting and decolorizing resin regeneration step are subjected to treatment, in the production procedure of the stevioside. According to the comprehensive water-saving process, a water extracting solution of a stevia leaf is subjected to resin adsorption; down-column waste water is subjected to rough filtration, primary filtration, ceramic film filtration, resin adsorption treatment, ozone treatment, adsorption filtration and reverse osmosis treatment in sequence to obtain purifier water which is directly used for the water extraction of the stevia leaf; abundant waste acid, waste alkali and waste water, which are produced in a resin regeneration procedure, are recycled; a water consumption is decreased by 70 percent or above; an acid consumption and an alkali consumption are decreased by 60 percent or above; meanwhile, by-products flavone and chlorogenic acid are obtained. According to the comprehensive water-saving process, a new pollutant does not be generated; no new chemical reagents are put; the quality of treated water is high; part of indexes are superior to those of underground water and municipal water; the ash content of a stevioside product can be decreased; the improvement of the purity and the yield of the product is facilitated; the industrial production value of the stevioside is improved.

The invention discloses a discoloring Shiva engineering bacterium with multiple functions of fluorescent tracing and discoloring and a construction method of the discoloring Shiva engineering bacterium, and aims at providing a genetic engineering bacterium that has high-efficiency discoloring capability of three major dyes including azo, anthraquinone and triphenylmethane as well as the fluorescent tracing function. The invention adopts the technical proposal that combines a foreign fusion gene SPrtpmD' into a discoloring Shiva bacterium S12; wherein, the fusion gene SPrtpmD' is formed by connecting a discoloring enzyme modifier gene tpmD' of the triphenylmethane dye after a NAD(P)H dehydrogenase gene initiator sequence of the discoloring Shiva bacterium S12, and the discoloring enzyme modifier gene tpmD' of the triphenylmethane dye is formed by adding an SD sequence before a 5'-end initiation codon of the discoloring enzyme modifier gene tpmD' of the triphenylmethane dye and adding asmall label that can chelate 6 encoding amino acids of a diarsenic fluorescent dye before a 3'-end termination codon. The discoloring Shiva engineering bacterium with multiple functions of fluorescent tracing and discoloring can be used for environmental reparation and administration.

The invention relates to the technical field of water purification and filtration, in particular to a water purifying and filtering device capable of efficiently killing bacteria and degrading organic compounds. The water purifying and filtering device comprises a controller, a box body (1), a water inlet pipe (2), a ventilating pipe (3), an air source assembly (4), water guiding pipes (5), ultrasonic transducers (6), laser transmitting pipes (7) and a water outlet opening (8), wherein the water inlet pipe (2) penetrates through the box body and enables untreated water to enter from one end of the water inlet pipe; the ventilating pipe (3) extends in the other end of the water inlet pipe and is used for ventilating the untreated water in the water inlet pipe; the air source assembly (4) is communicated with the ventilating pipe and is used for ventilating the ventilating pipe; the water guiding pipes (5) are communicated with the other end of the water inlet pipe and are used for guiding water in the water inlet pipe into the lower part of the box body; the ultrasonic transducers (6) are arranged at the bottom of the box body; the laser transmitting pipes (7) are arranged on the box body; the water outlet opening (8) is formed in the box body; and the air source assembly (4), the ultrasonic transducers (6) and the laser transmitting pipes (7) are separately and electrically connected with the controller. The water purifying and filtering device disclosed by the invention can efficiently kill bacteria in the water and degrade the organic compounds in the water.

The invention discloses an ABP process and equipment for recycling reclaimed water of printing and dyeing wastewater. The equipment comprises a pretreatment system, a neutralization tank, a coagulative precipitation tank, a hydrolytic acidification tank, an A / O reaction tank, a first ABP reaction tank, an ozone catalyzed oxidation system, a second ABP reaction tank and a powder ion exchange resin system, wherein the pretreatment system is sequentially connected with the neutralization tank, the coagulative precipitation tank, the hydrolytic acidification tank, the A / O reaction tank, the first ABP reaction tank, the ozone catalyzed oxidation system, the second ABP reaction tank and the powder ion exchange resin system through a pipeline. According to the equipment for recycling the reclaimed water of the printing and dyeing wastewater, an efficient biological enriched denitrification filler is arranged in the biochemical tank, the ABP process is combined with pretreatment of the printing and dyeing wastewater, i.e., cooling and coagulative precipitation, and deep treatment, i.e., decolorization and demineralization treatment of powder ion exchange resin, and physical and quality control indexes for the efficient biological enriched filler are further established according to preliminary designed and determined process flows; and the practicability is high, so that popularization is facilitated.

The invention provides a black and odorous riverway sewage treatment process which comprises the following steps: (1) flocculation treatment: introducing black and odorous riverway sewage into a sewage treatment tank, regulating the pH value to 7-8, and adding a flocculant for flocculation treatment; (2) aerobic treatment: introducing the sewage into an aerobic tank for aerobic treatment; (3) electro-Fenton treatment: introducing the sewage into an electro-Fenton reaction device for electro-Fenton treatment; (4) adsorption treatment: introducing the sewage into an adsorption tank, and adding avermiculite / diatomite / activated carbon composite adsorbent for adsorption treatment; (5) photocatalytic treatment: introducing the water into a photocatalytic tank, adding a photocatalyst nickel-doped nano titanium dioxide, and carrying out photocatalytic treatment; when the treatment process is used for treating black and odorous riverway sewage, the removal rate of COD, ammonia nitrogen and TPis high, and the deodorization and decolorization effects are good.

The invention relates to a membrane component containing fillers and belongs to the technical field of water cleaning. The membrane component containing the fillers is characterized in that a membrane element is arranged in the membrane component, a filling space is formed in the membrane component and the filling space is filled with particle fillers. The membrane component effectively reduces the pollution load of the membrane and has an effect of cleaning a pollution belt on the surface of the membrane during filtration.

The invention discloses an excess sludge treatment method which comprises the following steps: adding excess sludge to a reaction tank, with high speed stirring at 15-50 DEG C, adding a surfactant and sodium percarbonate to the reaction tank, after 0.5-5h of reaction, adding nano zero-valent iron, at 15-50 DEG C reacting for 1-8h, sending the sludge into a magnetic separator to remove the nano zero-valent iron containing heavy metals in the sludge; performing mechanical dewatering of the treated sludge to respectively obtain purified sludge and water. The excess sludge treated by the method is low in water content and high in heavy metal removal rate, the treated water is low in (chemical oxygen demand) COD value, and the excess sludge treatment method is low in cost, green, and free of secondary pollution, and can lay a foundation for agricultural or forestry sludge or other resource method.

The invention discloses a comprehensive water-saving process for producing stevioside. Down-column water generated in a resin adsorption step is subjected to purification treatment and a waste acid, a waste alkali and waste water, which are generated in an adsorption resin and desalting and decolorizing resin regeneration step are subjected to treatment, in the production procedure of the stevioside. According to the comprehensive water-saving process, a water extracting solution of a stevia leaf is subjected to resin adsorption; down-column waste water is subjected to rough filtration, primary filtration, ceramic film filtration, resin adsorption treatment, ozone treatment, adsorption filtration and reverse osmosis treatment in sequence to obtain purifier water which is directly used for the water extraction of the stevia leaf; abundant waste acid, waste alkali and waste water, which are produced in a resin regeneration procedure, are recycled; a water consumption is decreased by 70 percent or above; an acid consumption and an alkali consumption are decreased by 60 percent or above; meanwhile, by-products flavone and chlorogenic acid are obtained. According to the comprehensive water-saving process, a new pollutant does not be generated; no new chemical reagents are put; the quality of treated water is high; part of indexes are superior to those of underground water and municipal water; the ash content of a stevioside product can be decreased; the improvement of the purity and the yield of the product is facilitated; the industrial production value of the stevioside is improved.

A process for treating the sewage generated in extracting saponin from yam by hydrochloric acid method includes such steps as draining said sewage in quality and flow regulating pool, pumping it in pH regulating, reacting and depositing pool, flowing in aerating and electrolyzing reactor for pre-treating, flowing in another pH regulating, reacting and depositing pool, heating to 35-40 deg.C, anaerobic treating, inoculating Cl-resistant microbes, aerobic treating, inoculating Cl-resistant microbes, coagulating, depositing, oxidizing by ozone and adsorbing by activated carbon.

The invention discloses a mineral coagulant aid for treating water and a preparation method thereof. The preparation method comprises the following steps: S1) adding silicate into water at solid-to-liquid ratio of 1:(5-10), thereby forming a silicate solution; S2) adding 0.1-0.5% of dispersing agent into the silicate solution in mass percent; S3) performing settling separation on the silicate solution, taking the upper suspended solids, performing solid-liquid separation on the upper suspended solids and taking the solid as an intermediate solid product; S4) adding chitosan into glacial acetic acid, wherein the ratio of chitosan to glacial acetic acid is 1-5g: 1L, stirring and then forming a first mixed solution; S5) adding the intermediate solid product into the first mixed solution, wherein the ratio of the intermediate solid product to the mixed solution is 1g: 5-10mL, stirring and then forming a second mixed solution; S6) performing solid-liquid separation on the second mixed solution and drying the solid under the condition at 50-80 DEG C, thereby acquiring an environmental mineral coagulant aid. The mineral coagulant aid cannot cause the secondary pollution, is safe and reliable and is suitable for water treatment.

The invention relates to a membrane module with filler inside, belonging to the technical field of water purification. The invention relates to a membrane module with filling inside. The membrane element is arranged inside the membrane module, and a filling space is arranged inside the membrane module. The filling space is filled with granular filler. The membrane module effectively reduces the pollution load of the membrane itself, and has the effect of cleaning the pollution on the surface of the membrane during filtration.

The invention discloses a nano-loading zero-valent-iron-based PVDF (Polyvinylidene Fluoride) compound material as well as a preparation method and application thereof. The main preparation method comprises the following steps of: (1) pretreating a PVDF microfiltration membrane; (2) functioning the PVDF filter membrane by taking acrylic acid (AA) as a functional monomer; (3) respectively immersing the functioned PVDF filter membrane into sodium salt and soluble iron salt solutions for ion exchange, loading iron ions on the functioned PVDF filter membrane; and (4) immersing the PVDF filter membrane into a borohydride salt solution so as to prepare the nano-loading zero-valent-iron-based PVDF compound material under the strong reduction action. By respectively repairing simulative dyeing wastewater, heavy metal wastewater and anionic organic wastewater at the room temperature through using the reduction function of the material, the nano-loading zero-valent-iron-based PVDF compound material as well as the preparation method and the application thereof disclosed by the invention are conveniently and simply operated and easily recycled, have the advantages of low cost and good dispersity of nano iron particles, and are capable of reducing ecological risks caused by that the nano iron particles flow into water so as to improve the service cycle of the compound material. The nano-loading zero-valent-iron-based PVDF compound material can be regarded as an environment-friendly environment restoration material.

The invention belongs to the field of papermaking and discloses a method for preparing recycled newsprint from old newsprint. A modified filler material is further prepared by taking calcium carbonateas a raw material, taking chitosan, octadecanoic acid and sodium hydroxide as coating agents and taking calcium chloride as a cross-linking agent. The surface of calcium carbonate can be well coatedwith a cross-linking agent of cationic chitosan and softened to completely combine with fibers, and accordingly binding force between modified calcium carbonate and the fibers can be enhanced, the retention rate of filler calcium carbonate is increased, newsprint production cost can be reduced, and environment pollution load can be reduced. Problems of poor newsprint quality and environment pollution caused by all existing recycled newsprint processes are solved.